WCF Test Client error: Failed to Invoke the service

Question

I'm getting an error when trying to use the WCF Test Client with my WCF service. Here is the service code:

[ServiceContract]
public interface IEmployeeService
{
    [OperationContract(Name = "GetEmployee")]
    [WebGet(RequestFormat = WebMessageFormat.Xml,
        UriTemplate = "/Employees/{employeeNumber}")]
    Employee GetEmployee(string employeeNumber);
}

public Employee GetEmployee(string employeeNumber)
{
    var employeeNumberValue = Convert.ToInt32(employeeNumber);
    var employee = DataProvider.GetEmployee(employeeNumberValue);
    return employee;
}

<system.serviceModel>
    <services>
        <service name="Employees.Services.EmployeeService"
                 behaviorConfiguration="metaBehavior">
            <endpoint address=""
                      behaviorConfiguration="webHttp"
                      binding="webHttpBinding"
                      contract="Employees.Services.IEmployeeService">
            </endpoint>
            <endpoint address="mex"
                      binding="mexHttpBinding"
                      contract="IMetadataExchange">
            </endpoint>
        </service>
    </services>
    <behaviors>
        <endpointBehaviors>
            <behavior name="webHttp">
                <webHttp/>
            </behavior>
        </endpointBehaviors>
        <serviceBehaviors>
            <behavior name="metaBehavior">
                <serviceMetadata httpGetEnabled="true" />
            </behavior>
        </serviceBehaviors>
    </behaviors>
</system.serviceModel>

I am able to connect to the service using the WCF Test Client, but when I try to invoke GetEmployee(employeeNumber) I get the following error:

Failed to invoke the service. Possible causes: The service is offline or inaccessible; the client-side configuration does not match the proxy; the existing proxy is invalid. Refer to the stack trace for more detail. You can try to recover by starting a new proxy, restoring to default configuration, or refreshing the service.

I was able to successfully call this service by sending a request from the browser.

Any idea why I can't use the WCF Test Client?

Answer 1

Please ignore my earlier answer. I don't think the problem is at the client-side config.

See WCF Test Client and WebHttpBinding.

This is a limitation of the web programming model itself. Unlike SOAP endpoints (i.e., those with BasicHttpBinding, WSHttpBinding, etc) which have a way to expose metadata about itself (WSDL or Mex) with information about all the operations / parameters in the endpoint, there's currently no standard way to expose metadata for a non-SOAP endpoint - and that's exactly what the webHttpBinding-based endpoints are. In short, the WCF Test Client won't be useful for web-based endpoints. If some standard for representing web-style endpoints emerges when WCF ships its next version, we'll likely update the test client to support it, but for now there's none widely adopted.

Answer 2

I think your config is wrong,you should add node security mode="None" and attribute bindingConfiguration="NoneSecurity"

Change as my config, try again:

<system.serviceModel>
    <bindings>
      <wsHttpBinding>
        <binding name="NoneSecurity"
          maxBufferPoolSize="12000000" maxReceivedMessageSize="12000000" useDefaultWebProxy="false">
          <readerQuotas maxStringContentLength="12000000" maxArrayLength="12000000"/>
          <security mode="None"/>
        </binding>
      </wsHttpBinding>
    </bindings>
    <services>
      <service behaviorConfiguration="Elong.GlobalHotel.Host.IHotelAPIBehavior"
        name="Elong.GlobalHotel.Host.IHotelAPI">
        <endpoint address="" binding="wsHttpBinding" bindingConfiguration="NoneSecurity" contract="Elong.GlobalHotel.Host.IIHotelAPI">
          <identity>
            <dns value="localhost" />
          </identity>
        </endpoint>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="Elong.GlobalHotel.Host.IHotelAPIBehavior">
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="false" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>

Answer 3

  I had a similar problem, the solution was in a minor error in the message alias ... that very generic message ... in our case was assigned a Boolean false if the right is true.
  This value was in the MDM application that was running on websphere.

the path in my case:

   /opt/infamdm/hub/server/resources/cmxserver.properties
   /opt/infamdm/hub/cleanse/resources/cmxcleanse.properties